Well IMO they both were not evil. Maxis was the head of a large group of scientists that needed funding during a war. He accepted an offer to make weapon for money. That's not evil that's a business decision that any CEO would make in order to keep furthering their dream. (Well most anyway)

At that point I still feel like Richtofen was slimy and sneaky. Maxis is just a boss who is forced to make boss decisions.

(Thank you for pointing out the whole "besides a nazi" part. Made my reply much shorter!)